package com.hmdp.utils;

import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class LoginInterceptor implements HandlerInterceptor {

    /**
     * 1. 获取redis的用户
     * 2. 判断用户是否存在
     * 3. 不存在，拦截，返回401状态码
     * 4. 放行
     */

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
      //1.判断是否需要拦截
     if(UserHolder.getUser()==null){
         //没有用户需要拦截,设置状态码
         response.setStatus(401);
            return false;
     }
     return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}
